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J. F. MOELROY. TEMPERATURE REGULATOR.

No. 436,045. Patented Sept. 9, 1890.

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1 Jcimes flfcflrq UNITED STATES PATENT OFFICE.

JAMES F. MOELROY, OF ALBANY, NE\V YORK, ASSIGNOR TO THE CONSOLI- DATED OAR HEATING COMPANY, OF SAME PLACE.

TEM PERATU RE-REGULATO R.

SPECIFICATION forming part of Letters Patent No. 436,045,dated$eptember 9, 1890.

Application filed June 14, 1890.

To all? whom it may concern:

Be it known that I, JAMES F. MOELROY, a citizen of the United States, residing at Albany, in the county of Albany and State of New York, have invented certain new and usefulImprovements in Temperature-Regulators, of which the following is a specification, reference being had therein to the accompanying drawings.

This invention relates to new and useful improvements in temperature-regulators; and the invention consists in the peculiar construction of the thermostat, comprising a receptacle filled with an absorbing material such as charcoal-charged to saturation with a gas at a temperature lower than that atwhich the device is desired to act, said gas being adapted to be liberated to actuate the steamvalve through the connecting-levers when the temperature rises above the point at which the device was charged.

The invention further consists in thepeculiar construction, arrangement, and combination of the various parts.

The invention further'consists in the process employed in construcing the thermostat, all as more fully hereinafter described.

In the drawings, Figure 1 is a rear elevatron of my temperature-regulator with the valve in section. Fig. 2 is a vertical central section through the thermostat, partly in elevation.

A is a hollow disk, within which is the chamber 13. This disk has a central boss 0, to which is secured the circular plate D, preferably by casting it integral therewith, and which extends to nearly the edge of the disk A.

E is an annular flange at the outer edge of the plate D, extending at right angles thereto.

F is'an annular raised bearing formed on the inner face of the plate D.

The flange E is interiorly screw-threaded to receive the securing-plate G, by means of which the flexible diaphragm H is clamped tightly upon the bearing F, forming a yielding wall for the chamber B. Within this chamber is placed some substance which has great absorptive capacity for gases for instance, charco al in a finely-powdered condi- 50 tion. This I retainin position'by means of Serial No. 355,430. (No model.)

the screen I, held in position by the ring I screwed into the interior of the boss 0.

J is a bearing-plate secured on one end of the bell-crank lever, bearing centrally against the diaphragm. The other end of the lever K 5 5 is forked and engages with the pin L upon the vertical rod M, which is connected to the balanced valve 0, controlling the supply heating medium. This valve is held normallyopen by the spring P, which gears against the lug P, and at its upper end rests in the recessed adj usting-nut Q at its lower end.

It is a lock-nut upon the rod M to hold it in its adjusted position.

The chamber B is charged with the expansive gas in the following manner: The gas which I preferably use is carbonic-acid gas, and the material which I use in the chamber B into which to store this gas is charcoal freshly burned. Charcoal, either in the form of solid pieces or in a pulverized condition, is placed within the chamber B, and the screen I is then'inserted and held in position by the ring I The casting is then placed in the oven, where it is subjected to a temperature of about 7 5 800 Fahrenheit. This will drive out any moisture orgas which has already been ab- 7 sorbed by the charcoal. The casting is then lowered into a vessel filled with carbonic-acid ga' s andallowed to cool down to about 50 Fahrenheit. During this time, as the casting and its contents 0001, the charcoal will absorb a large amount of the gas. In lowering from 800 to 50 it will haveabsorbed from twenty five to thirty-five times its volume of such gas. The temperature of the casting is then raised to about 66, at which temperature the diaphragm is placed in position and securely sealed by the clamping-ring G. The connections are now made between the diaphragms 0 and the valve in the manner described, and the device is ready for operation. As the temperature in the room in which the device is placed rises above 66-say t0 70-temperature, the gas will be liberated from the charcoal, and it has thereby moved the diaphragm and throng 1 the connecting-levers closed the valveO. As soon as the temperature lowers again the charcoal will then absorb the gas and the spring P will open the valve, allow- 10o ing the heating medium such as steam-to again enter the radiators.

By the use of the material described I am enabled to use a rubber diaphragm, as carbonic=acid gas will have no ill effects upon the same. There is no danger of oxidizing the metal, as in the use of a liquid, and I am enabled to get most positive results with great pressure from the expansion-chamber thus charged.

WVhat I claim as my invention is 1. A thermostat comprising a medium charged to saturation With a gas at or near the temperature desired to be maintained, a vessel inclosing said medium, and means for applying the expansive power of the gas, substantially as described. V

2. A thermostat comprisinga solid medium charged to saturation with a gas at or near the temperature desired to be maintained, and a vessel inclosing said medium having a movable wall or diaphragm, substantially as described.

3. A thermostat comprising a body of charcoal charged to saturation with carbonic-acid gas at or near the temperature desired to be maintained, a vessel inelosing said medium, and means for applying the expansive power of the gas, substantially as described.

4. In a thermostat, the chamber B, the diaphragm H, forming one Wall of said chamber, the connections operated by the movement of said diaphragm, and a medium in said chamber charged to saturation with a gas adapted to be liberated upon an increase in temperature, substantially as described.

5. In a thermostat, the chamber B, the diaphragm I-I, forming one Wall of said chamber, the connectionsoperated by said diaphragm,

and a medium in said chamber charged to satu- 4o ration with a gas liberated upon an increase in temperature to move said diaphragm against a spring adapted to restore said diaphragm to its normal position upon the lowering of the temperature, substantially as described.

In testimony whereof I alfix my signature in presence of two witnesses.

JAMES F. MCELROY. Witnesses:

EDWIN A. SMITH, J OHN B. BRAIDWOOD. 

